>> If you can find actual software documentation that says, for example,
>> "Copyleft * 2000 by Bernd Warken" (where * substitutes for the
>> copyleft symbol), then that would be more convincing evidence of the
>> need to encode the character.

>There are such documents. The manual pages groff(7), groff_tmac(5), and
>roff(7) were written by me, with the legal ownership donated to the Free
>Software Foundation.

So the Free Software Foundation holds the, ahem, copyright to these
documents while you have, by the sound of it, reserved the right to be
identified as the author of these documents.

>We would really like to use the copyleft sign as
>soon as possible - with some U+xxxx code.